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Loans - Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans:
Loans - Gross	$ 823,771	$ 758,820
Less: Net deferred loan fees and costs	(747)	(726)
Loans after net deferred loan fees and costs	823,024	758,094
Less: Allowance for loan losses	(6,868)	(6,784)	$ (6,057)	$ (5,905)
Loans-Net	816,156	751,310
Agricultural Real Estate [Member]
Loans:
Loans - Gross	64,073	62,375
Loans after net deferred loan fees and costs	64,044	62,336
Agricultural [Member]
Loans:
Loans - Gross	95,111	84,563
Loans after net deferred loan fees and costs	95,238	84,692
Industrial Development Bonds [Member]
Loans:
Loans - Gross	6,415	5,732
Loans after net deferred loan fees and costs	6,415	5,732
Consumer Real Estate [Member]
Loans:
Loans - Gross	83,620	86,234
Loans after net deferred loan fees and costs	83,200	85,873
Commercial Real Estate [Member]
Loans:
Loans - Gross	410,520	377,481
Loans after net deferred loan fees and costs	409,953	376,887
Consumer [Member]
Loans:
Loans - Gross	37,757	33,179
Loans after net deferred loan fees and costs	37,802	33,213
Commercial and Industrial [Member]
Loans:
Loans - Gross	126,275	109,256
Loans after net deferred loan fees and costs	$ 126,372	$ 109,361

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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